1,720,983 research outputs found
Integration of Ground Penetrating Radar with Global Position System and Inertial Measurement Unit for archaeological application
No full textIn the last years, Ground Penetrating Radar (GPR) technology has been used extensively in different fields of heritage investigation. The use of other technics that integrate GPR technology as Global Positioning System (GPS) together with Inertial Measurement Unit (IMU) can effectively improve the precision of buried object location, by means of an efficient control of route and attitude of the GPR. This article aims at investigate on some technics oriented to the issues solution, as those that are consequence of used specific detection methods, e.g. GPR pulled by a terrestrial vehicle or carried by an aerial platform. Moreover, we present a basic structure of our low cost design, which integrates functionalities of GPS and IMU dedicated to GPR’s use
Efficient energy harvesting for microbial fuel cell dedicated to wireless sensor network
No full textMicrobial Fuel Cell (MFC) is novel technology for harvesting a fully sustainable zero emissions bioenergy that, by means of dedicated electronic circuits, suitably can be used for the proper functioning of a single Wireless Sensor Network (WSN) node. MFC is a bioreactor that transforms energy stored in chemical bonds of organic compounds into electrical energy. Low-power electronic devices allow now the design of electronic systems characterized by very low energy consumption. Accordingly, this allows the use of power sources based on energy harvesting techniques that involve clean renewable sources as MFC The first section of the paper introduces technological characteristics of the cell. The second one briefly examines the gap between electrical supplying of the cell and the energy requirements of WSN nodes. The design requires the usage of a step-up DC/DC converter, so the last part of the paper deals with the problems that occur when you want realize a system including a single MFC reactor for powering a single WSN nod
Development of embedded and user-side software for interactive setup of a frequency-modulated continuous wave ground penetrating radar dedicated to educational purposes
No full textThis paper describes the software and firmware programs for interactive control of a frequency-modulated continuous-wave ground-penetrating radar (GPR). The presented radar system is being developed at Sapienza University of Rome in the framework of the project carried out by European Cooperation in Science and Technology (COST) Action TU1208. The research is focused on developing an affordable GPR and introducing it into the educational process. At the current stage of the project a GPR prototype was implemented from off-the-shelf components, it combines cheapness with fine operating characteristics and allows studying different signal modulation patterns. The developed software for the GPR prototype proper functioning was written in Python, it provides graphical user interface allowing simple and convenient user interaction with the system. Moreover, a complementing firmware program was developed to realize control functionalities such as selecting frequency range, period and waveform of the transmitted signal
Nanofiber applications in microbial fuel cells for enhanced energy generation: a mini review
No full textMicrobial fuel cells (MFCs) represent simple devices that harness the metabolic activities of microorganisms to produce electrical energy from diverse sources such as organic waste and sustainable biomass. Because of their unique advantage to generate sustainable energy, through the employment of biodegradable and repurposed waste materials, the development of MFCs has garnered considerable interest. Critical elements are typically the electrodes and separator. This mini-review article presents a critical assessment of nanofiber technology used as electrodes and separators in MFCs to enhance energy generation. In particular, the review highlights the application of nanofiber webs in each part of MFCs including anodes, cathodes, and membranes and their influence on energy generation. The role of nanofiber technology in this regard is then analysed in detail, focusing on improved electron transfer rate, enhanced biofilm formation, and enhanced durability and stability. In addition, the challenges and opportunities associated with integrating nanofibers into MFCs are discussed, along with suggestions for future research in this field. Significant developments in MFCs over the past decade have led to a several-fold increase in achievable power density, yet further improvements in performance and the exploration of cost-effective materials remain promising areas for further advancement. This review demonstrates the great promise of nanofiber-based electrodes and separators in future applications of MFCs
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
GPR/GPS/IMU system as buried objects locator
No full textIn the last years, Ground Penetrating Radar (GPR) technology has been extensively used in several different fields, including archaeology and cultural-heritage diagnostics. The integration of GPR with other positioning devices, such as a Global Positioning System (GPS) and an Inertial Measurement Unit (IMU), can significantly improve the accuracy of buried-object location, by means of an efficient control of GPR route and attitude. This article aims at investigating solutions for an accurate location of buried objects when a GPR is pulled by a terrestrial vehicle or carried by an aerial platform. In particular, a low-cost system is presented, which integrates functionalities of GPS and IMU specifically dedicated to GPR use. The device has been designed, realized and finally its performance was tested in the laboratory
Dispelling the Myths Behind First-author Citation Counts
Full text linkWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
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